1999 Audi A4 (6 cyl) 2.8
B5 w/ error codes p1136, p1138.

Any ideas of which would generate these codes? I assumed it could be a dirty fuel filter, replaced that no luck. The Audi runs considerably better though. To the best of my understanding it could be a faulty MAF or some leaky vacum lines. Any specific place I could find these vacum lines? I am pretty much clueless on the engine without a diagrahm. Any help would be greatly appericated.

Thanks!

 

check your MAF, fuel pump and clean your precat o2 sensors. the passenger side 02 sensor is visible when you take out the airbox. the driver's side 02 sensor is visible when you move the coolant reservoir out of the way. also seafoam your car

 

Thanks for the help! I will do this as soon as I can get caught up. I really appericate your reply. I will repost with results